However, if the HT fuse blows again, it may indicate a serious valve failure where internal parts of a
valve are shorted and in this case the amplifier needs to be checked by a qualified engineer to assess the
problem.
Output power switch
You can run your V100 at either high or low power. This switches between full high tension voltage and
around 60 per cent of the high tension voltage, thus lowering the output power to around 30 watts and
enabling the output stage to be pushed into overdrive much more easily.
Speaker Outputs
PLEASE NOTE: The lightning flash with arrowhead symbol, within an equilateral triangle, is intended to
alert the user to the presence of uninsulated ‘dangerous voltage’ within the product’s enclosure that
may be of sufficient magnitude to constitute a risk of electric shock. Terminals labelled as “Speaker
Outputs” must be connected to a speaker cabinet of the designated load rating using an un-shielded two
conductor cable for speaker use at all times during operation. Never use a guitar cable to connect the
amplifier to a speaker as this presents the amplifier with a ‘capacitive load’. This can cause instability or
oscillation which may seriously damage valves and/or the expensive output transformer.
The output transformer in the V100 has 3 separate secondary windings; a 4 Ohm, an 8 Ohm and a 16
Ohm. This makes it easy to connect many different combinations of speakers. There are five speaker
output jacks: 2 x 4 ohms, (wired in parallel), 2 x 8 ohms, (wired in parallel) and 1 x 16 ohms.
So here are all the possible combinations:
1. For a single 4 Ohm cabinet, use either of the 4 Ohm sockets.
2. For a single 8 Ohm cabinet, use either of the 8 Ohm sockets.
3. For a single 16 Ohm cabinet, use the 16 Ohm socket.
4. For a pair of 8 Ohm cabinets, use both of the 4 Ohm sockets
5. For a pair of 16 Ohm cabinets, use both of the 8 Ohm sockets.
OUTPUT VALVE FUSES and LED’s
The two panel mounted fuse holders protect each pair of output valves as labelled.
If an output valve starts to draw too much current, indicating it could be about to self-destruct, the
corresponding fuse will sense this and blow, turning off both valves in the pair and lighting the LED
above.
This will result in a reduction of output power but will mean the amplifier continues to function during a
performance despite a possible valve failure. In many cases on most amplifiers a valve failure would
result in the valve drawing so much current that the mains fuse blows, effectively ending a performance.
On the V100 however, due to the discrete way in which an output valve fuse would blow, it may go
completely unnoticed to the performer, until the LED on the rear panel is noticed as being on.
What to do if an LED is discovered as being lit:-
When convenient turn off the unit.